Entrotec ED4 modification

Hi guys. I have Entrotec rh3+/ed4My ring in theory is working. The trouble is that for my system to be fully operational I need to lift the phone handle of the hook, otherwise I can’t open the door. Any ideas on how to modify my existing handset? I attached a picture, the cradle switch is the issue (SW1, sw2). Please let me know if there is any way around that or what handset I could replace mine with to make it work.